The sternohyoid muscle is a thin, narrow muscle attaching the hyoid bone to the sternum.[1][2] It is one of the paired strap muscles of the infrahyoid muscles,[3] serving to depress the hyoid bone.[1][4] It is innervated by the ansa cervicalis.[2][5]
Structure
The sternohyoid muscle arises from the posterior border of the medial end of the clavicle, the posterior sternoclavicular ligament, and the upper and posterior part of the manubrium of the sternum.[1][2] Passing upward and medially, it is inserted by short tendinous fibers into the lower border of the body of the hyoid bone.[1][2] It runs lateral to the trachea.[1]
Innervation
The sternohyoid muscle is innervated by a branch of the ansa cervicalis.[2][5]
Variations
Doubling; accessory slips (Cleidohyoideus); absence.
It sometimes presents, immediately above its origin, a transverse tendinous inscription.
Function
The sternohyoid muscle performs a number of functions:
- depresses the hyoid bone[1][4]
- helps with speech[1]
- helps to move the head and neck.[1]
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